<?php
function _has_rank_1($arr){
  return array_key_exists(1,$arr);
}
$tarr1 = array( 1 => "a", 2 => "b", 3 => "c");
$tarr2 = array( 5 => "a", 2 => "b", 3 => "c");
//$ttarr = array_filter(array('12'=>$tarr1,'13'=>$tarr2),"_has_rank_1");

print_r(array_fill_keys($tarr1,0));
